Microdon. 585 



in mutabilis', on the venter also the fourth segment has long, pale 

 hairs. Genitalia black. Legs as in mutabilis and likewise wings, 

 squamulæ and balteres. 



Fig. 199. Antenna of M. devius d", from the inside. X 40. 



Female. Similar, and differing from the female of mutabilis by 

 the same characters as in the male; vertex and frons with many black 

 hairs to almost quite black-haired. 



Length 10 — 11 mm. 



M. devius is rare in Denmark; Dyrehaven (Drewsen), at Sorø 

 (Schlick); on Lolland at Bremersvold (Løvendal) and in Merrits Skov 

 (L. Jørgensen). The dates are ^% — ^'^Ve. 



Geographical distribution : — Europe down into Italy ; towards the 

 north to northern Sweden, and in Finland. 



3. M. Eggeri Mik. 



1897. Mik, Wien. ent. Zeitg. XVI, 66 et 1899. XVIII, 138. — 1900. 

 Strobl, Wiss. Mittheil. Bosn. Herzeg. VII, 585. — 1903. Villen. Bull. Soc. 

 Entom. de Fr. 193. — 1907. Kat. palåarkt. Dipt. III, 154. — M. hrevicornis 

 Egg. (nec Loew) 1862. Verh. zool. bot. Geseli. Wien, XII, 783. — M. lati- 

 frons 1893. Strobl (nec Loew) Mittheil. Ver. Steierm. XXIX, 198. — M. muta- 

 bilis 1883. Poujade (nec L.) Ann. de la Soc. Ent. de Fr. 6, III, 23, PL I, 

 fig. 1—16. 



Male. Again this species is rather similar to the two preceding; 

 frons broader, the line between the two upper corners of the eye 

 scarcely as long as the breadth of the frons on its narrowest point 

 (while in the two other species it is longer) ; vertex and frons yellow- 

 haired. Antennæ with the third joint about twice as long as the 

 second; arista short, shorter than the third joint. Scutellum æneous, 

 the spines small, especially thin, not broad at the base, the margin 

 of scutellum between them not concave; thorax all yellow-haired, 

 scutellum with paler hairs. The wedge-shaped space on pleura above 

 the front coxæ not quite polished, but somewhat striated on its 

 anterior part. Abdomen as in the other species, the pale hairs some- 



